Fix lint workflow failure by applying Black formatting updates

[Copilot]

The lint GitHub Actions job was failing because black --check . reported formatting drift. This PR brings the flagged Python files back into compliance with the repository’s Black configuration.

• Formatting-only updates in affected modules

  • Applied Black formatting to:
    • config/settings.py
    • tools/repo_parser.py
    • tools/test_selector.py
    • tools/test_executor.py

• No behavioral changes

  • Changes are limited to style normalization (quotes, wrapping, spacing, newline consistency), with no functional logic changes.

• Representative diff pattern

  # before
  repo_name = repo_url.rstrip('.git').split('/')[-1]
  
  # after
  repo_name = repo_url.rstrip(".git").split("/")[-1]